SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26 System description
Page 89 of 217
1.13.11 AssistNow clients and GNSS integration
Not supported by SARA-G300 and SARA-G310 modules.
For customers using u-blox GNSS receivers, SARA-G340, SARA-G350 and SARA-U2 modules feature embedded
AssistNow clients. AssistNow A-GPS provides better GNSS performance and faster Time-To-First-Fix. The clients
can be enabled and disabled with an AT command (see the u-blox AT Commands Manual [3]).
SARA-G340, SARA-G350 and SARA-U2 modules act as a stand-alone AssistNow client, making AssistNow
available with no additional requirements for resources or software integration on an external host micro
controller. Full access to u-blox positioning receivers is available via the cellular modules, through a dedicated
DDC (I
2
C) interface, while the available GPIOs can handle the positioning chipset / module power-on/off. This
means that the cellular module and the positioning chips and modules can be controlled through a single serial
port from any host processor.
1.13.12 Hybrid positioning and CellLocate
®
Not supported by SARA-G300 and SARA-G310 versions.
Although GNSS is a widespread technology, reliance on the visibility of extremely weak GNSS satellite signals
means that positioning is not always possible, particularly in shielded environments such as indoors and enclosed
park houses, or when a GNSS jamming signal is present. The situation can be improved by augmenting GNSS
receiver data with network cell information to provide a level of redundancy that can benefit numerous
applications.
Positioning through cellular information: CellLocate
®
u-blox CellLocate
®
enables the device position estimation based on the parameters of the mobile network cells
visible to the specific device. To estimate its position the module sends the CellLocate
®
server the parameters of
network cells visible to it using a UDP connection. In return the server provides the estimated position based on
the CellLocate
®
database. SARA-G340, SARA-G350 and SARA-U2 modules can either send the parameters of
the visible home network cells only (normal scan) or the parameters of all surrounding cells of all mobile
operators (deep scan).
The CellLocate
®
database is compiled from the position of devices which observed, in the past, a specific cell or
set of cells (historical observations) as follows:
To Next Page
Loading...
Need help?
General
